28073378844 has 84 divisors (see below), whose sum is σ = 84181688304. Its totient is φ = 8020959552.

The previous prime is 28073378843. The next prime is 28073378849. The reversal of 28073378844 is 44887337082.

It is a tau number, because it is divible by the number of its divisors (84).

It is a super-2 number, since 2×28073378844² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28073378843) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 667257 + ... + 708080.

It is an arithmetic number, because the mean of its divisors is an integer number (1002162956).

Almost surely, 2^28073378844 is an apocalyptic number.

It is an amenable number.

28073378844 is an abundant number, since it is smaller than the sum of its proper divisors (56108309460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28073378844 is a wasteful number, since it uses less digits than its factorization.

28073378844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375366 (or 1375349 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 54.

The spelling of 28073378844 in words is "twenty-eight billion, seventy-three million, three hundred seventy-eight thousand, eight hundred forty-four".